XWiki

XWiki is a WikiWiki clone written in Java that supports many popular features of other Wikis like the Wiki syntax, version control, attachments, security, and searching, but also many advanced features like templates, database and dynamic development using scripting languages (Velocity, Groovy, Ruby, Python, PHP, and more), an extension system and skinability, J2EE scalability, an XML/RPC remote API, statistics, RSS feeds, PDF exporting, WYSIWYG editing, an Office viewer and importer, and a lot more.

Recent releases

Release Notes: This milestone contains a new mail API and module to replace the old mailsender plugin, Flamingo skin and Extension Manager improvements, and various performances improvements and bugfixes.

Release Notes: This release introduces the ability to change the width of the panel columns, and comes with an improved Active Installs feature. Developers can now use the LESS preprocessor for skin stylesheets. A couple of bugfixes (18) and some small improvements (24) make this release worth trying.

Release Notes: This is the first version of the 6.x cycle, with performances improvements.
It marks the move to Java 7 as the minimum version and comes with a new experimental
Flamingo skin,
new chart renderers,
WebJars support, and many other improvements.

Recent comments

Possibly far more features than any other Wiki available, including embedded scripting within Wiki documents (a huge plus for me) and embedded Hibernation SQL/fulltext engine. Unfortunately, using most of these features in XWiki are undocumented for now. Definitely worth a look if you want something with a feature set on par with (or vastly surpasses) TWiki, but faster (Java-based, runs under Tomcat engine) and more dynamic like Zope.